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From the PowerPoint presentation of the 1997 sandwich paper.
Shown here is the effect of the stiffener web root on the top facesheet of the panel sandwich wall. If the web is a simple wall it applies a line moment to the top facesheet of the panel sandwich wall. If the web is also of sandwich wall construction, it imposes equal and opposite line loads where the two facesheets of the web intersect the top facesheet of the panel sandwich wall.
The local deformation of the top face sheet is amplified as the applied axial compression is increased, which can cause core crushing, core tensile failure, face sheet pull-off, core shear failure, and additional bending stresses in the top face sheet of the panel sandwich wall.
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